the thing that worried me about them being too small was the turbine housings are t25.

I assume you mean the compressor?

The compressor is too small to make more than 425 in a 10psi intercooled setup as I outlined. If you want less than 425 then they are fine. Cleaning up the housings, the waste gate, intercooling, and getting a properly matched cam will make a difference. Keep in mind though you will be done making power by 5,000 RPM, after that you'll be heating things up too much and looking to break something.

Not a bad idea for a daily driver though as it will have spool from idle on up, full boost really early.

There was an article about a Pontiac 455 with a single turbo that was way undersized a little while ago- made about 750 ftlb at 3,000 RPM. Only made about 550hp, but the torque was huge. Great for a daily driver, bad for a race car.